实现将GeoJSON点转换为地图,并在Android Studio的Kotlin中使用Mapbox定位我。

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英文:

Implement Geojson points to map and locate me with Mapbox, in Kotlin on Android Studio

问题

以下是您提供的代码的翻译部分:

// FRAGMENT HOME

class HomeFragment : Fragment() {

    private var mapView: MapView? = null

    @Nullable
    override fun onCreateView(
        inflater: LayoutInflater,
        @Nullable container: ViewGroup?,
        @Nullable savedInstanceState: Bundle?
    ): View? {
        Mapbox.getInstance(
            context!!.applicationContext,
            "MIO CODICE MAPBOX"
        )
        val view: View = inflater.inflate(R.layout.fragment_home, container, false)
        mapView = view.findViewById<View>(R.id.mapView) as MapView
        mapView!!.onCreate(savedInstanceState)
        return view
    }

    override fun onResume() {
        super.onResume()
        mapView!!.onResume()
    }

    override fun onPause() {
        super.onPause()
        mapView!!.onPause()
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        mapView!!.onSaveInstanceState(outState)
    }

    override fun onLowMemory() {
        super.onLowMemory()
        mapView!!.onLowMemory()
    }

    override fun onDestroyView() {
        super.onDestroyView()
        mapView!!.onDestroy()
    }
}

// HOST ACTIVITY:

class HostActivity : AppCompatActivity() {
    lateinit var googleSignInClient: GoogleSignInClient
    private lateinit var navController: NavController
    private val mAuth: FirebaseAuth = FirebaseAuth.getInstance()
    private val db: FirebaseFirestore = FirebaseFirestore.getInstance()
    private lateinit var drawerLayout: DrawerLayout
    private lateinit var navViewBinding: DrawerHeaderLayoutBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        setTheme(R.style.AppTheme)
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_host)
        val toolbar = customToolbar
        setSupportActionBar(toolbar)

        val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestIdToken(getString(R.string.default_web_client_id))
            .requestEmail()
            .build()
        googleSignInClient = GoogleSignIn.getClient(this, gso)

        drawerLayout = drawer_layout
        navViewBinding = DrawerHeaderLayoutBinding.inflate(layoutInflater, navView, true)
        val navHost = supportFragmentManager.findFragmentById(R.id.navHostFragment) as NavHostFragment
        navController = navHost.navController

        // ...(其余部分未提供翻译)

        if (!Prefs.getInstance(this)!!.hasCompletedWalkthrough!!) {
            if (mAuth.currentUser == null) {
                graph.startDestination = R.id.authFragment
            } else {
                getUserData()
                graph.startDestination = R.id.homeFragment
            }
        } else {
            graph.startDestination = R.id.onBoarding
        }
        navController.graph = graph

        NavigationUI.setupActionBarWithNavController(this, navController, drawerLayout)
        navView.setupWithNavController(navController)
        navView.setNavigationItemSelectedListener {
            it.isChecked
            drawerLayout.closeDrawers()
            when (it.itemId) {
                R.id.action_logout -> {
                    MyApplication.currentUser!!.active = false
                    FirestoreUtil.updateUser(MyApplication.currentUser!!) {
                        mAuth.signOut()
                    }
                    googleSignInClient.signOut()
                    MyApplication.currentUser = null
                    navController.navigate(R.id.action_logout)
                }
            }
            true
        }
    }

    private fun getUserData() {
        val ref = db.collection("users").document(mAuth.currentUser!!.uid)

        ref.get().addOnSuccessListener {
            val userInfo = it.toObject(UserModel::class.java)
            navViewBinding.user = userInfo
            MyApplication.currentUser = userInfo
            MyApplication.currentUser!!.active = true
            FirestoreUtil.updateUser(MyApplication.currentUser!!) {
            }
        }.addOnFailureListener {
            val intent = Intent(this, MyApplication::class.java)
            startActivity(intent)
            finish()
        }
    }

    override fun onSupportNavigateUp(): Boolean {
        return NavigationUI.navigateUp(navController, drawerLayout)
    }
}

请注意,翻译仅包括您提供的代码部分,不包括问题或其他内容。如果您有更多问题或需要进一步帮助,请随时提问。

英文:

My question is about Mapbox. In this period I am working on an ANDROID application based on mapbox, using Kotlin and Fragments and my problem concerns the visualization of points on the map itself. That is my need is to be able to show points on the map through a GEOJSON file, for now I have been able to see the map in full in the application, but I cannot find a way to show the points taken from a GeoJson file and locate myself in the map via a button.
I should implement both functions in the fragment, so my problem is precisely that of not being able to show the points of a geojson file and find a way to locate myself in the map itself. I await help if there is someone able to help me with this problem, I also leave the code of the fragment class in kotlin.
Thanks everyone in advance !!

FRAGMENT HOME

class HomeFragment : Fragment() {
private var mapView: MapView? = null
@Nullable
override fun onCreateView(
inflater: LayoutInflater,
@Nullable container: ViewGroup?,
@Nullable savedInstanceState: Bundle?
): View? {
Mapbox.getInstance(
context!!.applicationContext,
&quot;MIO CODICE MAPBOX&quot;
)
val view: View = inflater.inflate(R.layout.fragment_home, container, false)
mapView = view.findViewById&lt;View&gt;(R.id.mapView) as MapView
mapView!!.onCreate(savedInstanceState)
return view
}
override fun onResume() {
super.onResume()
mapView!!.onResume()
}
override fun onPause() {
super.onPause()
mapView!!.onPause()
}
override fun onSaveInstanceState(outState: Bundle) {
super.onSaveInstanceState(outState)
mapView!!.onSaveInstanceState(outState)
}
override fun onLowMemory() {
super.onLowMemory()
mapView!!.onLowMemory()
}
override fun onDestroyView() {
super.onDestroyView()
mapView!!.onDestroy()
}
}

HOST ACTIVITY :

class HostActivity : AppCompatActivity() {
lateinit var googleSignInClient: GoogleSignInClient
private lateinit var navController: NavController
private val mAuth: FirebaseAuth = FirebaseAuth.getInstance()
private val db: FirebaseFirestore = FirebaseFirestore.getInstance()
private lateinit var drawerLayout: DrawerLayout
private lateinit var navViewBinding: DrawerHeaderLayoutBinding
override fun onCreate(savedInstanceState: Bundle?) {
setTheme(R.style.AppTheme)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_host)
val toolbar = customToolbar
setSupportActionBar(toolbar)
val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build()
googleSignInClient = GoogleSignIn.getClient(this, gso)
drawerLayout = drawer_layout
navViewBinding = DrawerHeaderLayoutBinding.inflate(layoutInflater, navView, true)
val navHost =
supportFragmentManager.findFragmentById(R.id.navHostFragment) as NavHostFragment
navController = navHost.navController
val navInflater = navController.navInflater
val graph = navInflater.inflate(R.navigation.main_graph)
navController.addOnDestinationChangedListener { _, destination, _ -&gt;
if (destination.id == R.id.onBoarding ||
destination.id == R.id.authFragment ||
destination.id == R.id.loginFragment ||
destination.id == R.id.signUpFragment
) {
toolbar.visibility = View.GONE
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
} else {
toolbar.visibility = View.VISIBLE
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
}
}
if (!Prefs.getInstance(this)!!.hasCompletedWalkthrough!!) {
if (mAuth.currentUser == null) {
graph.startDestination = R.id.authFragment
} else {
getUserData()
graph.startDestination = R.id.homeFragment
}
} else {
graph.startDestination = R.id.onBoarding
}
navController.graph = graph
NavigationUI.setupActionBarWithNavController(this, navController, drawerLayout)
navView.setupWithNavController(navController)
navView.setNavigationItemSelectedListener {
it.isChecked
drawerLayout.closeDrawers()
when (it.itemId) {
R.id.action_logout -&gt; {
MyApplication.currentUser!!.active = false
FirestoreUtil.updateUser(MyApplication.currentUser!!) {
mAuth.signOut()
}
googleSignInClient.signOut()
MyApplication.currentUser = null
navController.navigate(R.id.action_logout)
}
}
true
}
}
private fun getUserData() {
val ref = db.collection(&quot;users&quot;).document(mAuth.currentUser!!.uid)
ref.get().addOnSuccessListener {
val userInfo = it.toObject(UserModel::class.java)
navViewBinding.user = userInfo
MyApplication.currentUser = userInfo
MyApplication.currentUser!!.active = true
FirestoreUtil.updateUser(MyApplication.currentUser!!) {
}
}.addOnFailureListener {
val intent = Intent(this, MyApplication::class.java)
startActivity(intent)
finish()
}
}
override fun onSupportNavigateUp(): Boolean {
return NavigationUI.navigateUp(navController, drawerLayout)
}
}

答案1

得分: 0

你需要使用GeoJsonSource。https://github.com/mapbox/mapbox-android-demo/search?q=GeoJsonSource 展示了演示应用程序如何使用该数据源。

https://github.com/mapbox/mapbox-android-demo/blob/master/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/basics/KotlinSupportMapFragmentActivity.kt其 XML 布局文件

在地图上放置图标。https://docs.mapbox.com/android/maps/examples/marker-symbol-layer/。将所有图标设置放在片段的 onStyleLoaded() 回调内,如 https://github.com/mapbox/mapbox-android-demo/blob/master/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/basics/KotlinSupportMapFragmentActivity.kt#L51-L55 所示。

https://github.com/mapbox/mapbox-android-demo/search?q=loadGeojson 展示了演示应用程序如何从 GeoJson 文件加载。您可以使用协程来替代构建 AsyncTask。

尽管是 Java,https://docs.mapbox.com/android/maps/examples/show-a-users-location-on-a-fragment/ 展示了如何将 Maps SDK 的 LocationComponent 与片段结合使用。

关于在单击按钮时将摄像头移动到设备的上一次已知位置,参见我在 https://stackoverflow.com/a/64159178/6358488 中的回答。

英文:

You'll need to use a GeoJsonSource. https://github.com/mapbox/mapbox-android-demo/search?q=GeoJsonSource shows how the demo app uses the source.

https://github.com/mapbox/mapbox-android-demo/blob/master/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/basics/KotlinSupportMapFragmentActivity.kt (Its XML layout file)

Putting icons on the map. https://docs.mapbox.com/android/maps/examples/marker-symbol-layer/. Do all of the icon setup inside of the fragment's onStyleLoaded() callback as seen at https://github.com/mapbox/mapbox-android-demo/blob/master/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/basics/KotlinSupportMapFragmentActivity.kt#L51-L55

https://github.com/mapbox/mapbox-android-demo/search?q=loadGeojson shows how the demo app loads from a GeoJson file. You could use coroutines instead of building out the AsyncTask.

Although it's in Java, https://docs.mapbox.com/android/maps/examples/show-a-users-location-on-a-fragment/ shows how to combine the Maps SDK's LocationComponent with a fragment.

Regarding moving the camera to the device's last known location when a button is clicked, see my answer at https://stackoverflow.com/a/64159178/6358488

huangapple
  • 本文由 发表于 2020年10月6日 08:35:49
  • 转载请务必保留本文链接:https://go.coder-hub.com/64217833.html
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